Volume Booster
Make audio louder or quieter by a set number of dB, with distortion protection
Your files are processed on your device. The first use downloads a processing engine, which your browser then keeps.
Drop an audio file to change its volume
or click to browseor tap to choose
Make it louder or quieter by a set number of dB
Large files (over 5 GB) may take longer or run out of browser memory
About Volume Booster
Makes a quiet recording louder (or quieter) by a number of decibels you choose, with an optional limiter that stops loud peaks from distorting. Shows the loudest point of your file before and after. Runs in your browser; the audio is not uploaded, but the first use downloads a processing engine (about 25 MB).
Drop an audio file, choose how many dB to add with the buttons or slider, and click Change volume. Keep "Prevent distortion" ticked unless you want a hard boost. The page shows where the loudest point lands, then you preview and download.
+6 dB is twice the amplitude and +10 dB sounds roughly twice as loud. If the loudest point already sits near 0 dB there is no room to boost: the limiter will squash the peaks instead. For an even level across a whole recording, the Audio Volume Normalizer is the better tool.
- How many dB should I add?
- Start with +6 dB for a clearly quiet recording and +10 dB for a very quiet one. The page shows where the loudest point will land, so you can see the largest gain that stays clean.
- What does the limiter do?
- It holds the loudest peaks just under full scale so a boost does not turn into harsh clipping. The cost is that very loud moments are flattened if you push the gain too far.
- Will boosting make the background noise louder too?
- Yes. Gain lifts everything, including hiss and room noise. If noise is the problem, treat it first with the Background Noise Remover, then raise the volume.
- What is the difference between this and the Audio Volume Normalizer?
- The Volume Booster applies the number of dB you choose. The Audio Volume Normalizer measures the file and sets it to a target loudness for you.
- Does it keep my file format?
- Yes. MP3 stays MP3, WAV stays WAV and so on. Lossy formats are encoded again, so keep the original.
How to use Volume Booster
Drop an audio file. The page measures its loudest point and tells you how much you can add without clipping. Pick a gain with the +dB buttons or the slider (minus 20 to plus 30), keep Prevent distortion ticked, and click Change volume. Preview the result, see the new loudest point and download it in the same format as the original.
When to use it
Use it for a recording that is too quiet to hear, a voice memo made at a distance, a lecture or interview, or to lower a file that is too loud. It is a quick fix with a number you control.
When not to use it
It applies one fixed gain to everything, so quiet and loud parts stay in the same proportion. To bring a whole recording to a standard loudness, use Audio Volume Normalizer instead. It cannot remove noise or fix a recording that is distorted already; try Background Noise Remover for hiss.
Tips for best results
Look at the note under the file name: it says how many dB you can add before the loudest point hits the top. Each 6 dB doubles the amplitude and about 10 dB sounds twice as loud. If the limiter warning appears, a smaller boost often sounds cleaner than a bigger one that is squashed.
Limitations
Gain is limited to between minus 20 and plus 30 dB. A very large boost also lifts background noise. With the limiter on, peaks are held below about minus 0.3 dB, which keeps the sound from clipping but flattens the loudest moments if you push far. Lossy formats (MP3, M4A, OGG) are encoded again, so there is a small generation loss; WAV and FLAC stay lossless. Loudness readings are measured by your browser's decoder.
Privacy
The audio is processed in your browser and not uploaded. The first use downloads a processing engine of about 25 MB from a public CDN, which the browser keeps afterwards.
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